Can-end-folding machine



R. Ronan CAN BND FOLDING CHINE F11-ed Dec. 24, 1925 Patented'July 13,1926.

UNITED STATES PATENT OFFICE.l

RICHARD RODER, 0F ZEULENROD A/THURINGE, GERMANY, ASSIGNOR TO CARLKNEUSEL, 0F -ZEULENROD A/THURINGEN, GERMANY.

CAN-END-FOLDING MACHINE.

Application led December 24, 1925,Seria1 No. 77,636,V and in GermanyOctober 20, 1924.

The object of the present invention is a. driving gear for a foldingtool for closing machines, lwhich are used for closing noncircular cans.

The essential feature of the novel device consists in that the`positive` motion of the guiding rollers `with their` supports producedduring the workingprocess by the rolling or devolving action ofthenoncircular can is usednfor performing the workV of folding and that bythis positive motion of .the guiding rollers and its supports a feedingvmotion is imparted to the throwing or liftin curve, said feeding motionbeing adjustab e by means of a stop. f

Through this condition or operation the automatic rfeedinggrnotion ofthe folding rollers for forming the fold is produced di? `rectly at thesupports of the folding. and

guiding-rollers, the hitherto necessary driving members ofthefolding-.levers operated by the driving shaft through the machine arebeing obviated, and an adjustment to a greater or smaller number of canrevolutions for one single working operation is made possible and a moresimple and easier work` ing is Ohta-ined.

In the drawing one formv of embodiment of a folding machine according tothe two-- Ylever system (first-fand final or finishing roller) is shown.7

In the drawing- Fig. l is a side elevation of a complete machine,

Fig. 2 is a side view of the arrangementY of the tools,

Fig. 3 is a ground-plan of a disposition of the tools withfo1ding-roller-lever in the initial position previous to placing a caninto'the machine. f

Fig. 4 is a side-view of the tool-disposition with folding-roller-leverin .initial position prior to putting in a can.

Fig. is a plan-view of a tool-arrangement with folding-roller-lever inadvanced position after several revolutions of spindle during operation;

In these drawings a denotes a friction coupling operated by thefoot-pedal c and forming a coupling-connection between the drivingpulley and the working-spindle of the machine, which connectionispreserved also in case the foot-pedal is let go,

by means of a lever lw in the well-known manner, said lever fw beingprovided with a notch for the purpose. b and c are the two bottom disks,between'which the can to be folded is placed and held; d is the guidingcam corresponding to the noncircular shape of the can and rigidlyconnected to the upper bottoni-disk; e denotes the guide-roller-` leverarranged to oscillate on a pivot-pin f, which is provided at the body ofthe machine. Said lever e carries at one end the guiding roller g whichis positively guided in a slot in the guiding-cam cl, and which slotconforms to the shape of the cam. The foldingroller-lever i is carriedby the guiding-roller-lever c and is mounted on a pvot L. At the otherend of the lever e a pawl-lever k is provided and is pivoted at m, andprovided with a pawl Z. The foldingrollerlever i hereinbefore mentionedcarries at one end the folding roller n and atthe other end a carryingroller 0, which bears against a lifting-cam p. This lifting f Y rever,connected with the guiding roller lever e bymeans of a key-brake r sothat when the guiding roller lever e 1s osclllating around the pivotingpin f in a direction away from the working-spindle of the machine, thelifting cam-19 and the ratchet-wheel g are caused to revolve around f,as they are taken along by the key-brake r. They do not, therefore,change their position in regard to the guiding roller. lever e, but atan oscillating movement of the guide roller lever e in the op positedirection the ratchet-lever c will strike against the adjustable stop 8fixed to the body of the'machine turn on its pivot arm, and cause thepawl Z to move the ratchet-wheel g, and hence also the.` lifting cam pthrough a rotary movement around the pin 7" accelerated in relation tothe guide roller lever e, and change the position of said cam inyrelation to the guide roller lever e. As a result, the carrying roller`o of the folding roller lever z' oscillating with the guide roller levere will rise, to af higher point of the rising branch of the lifting camlill) be increased and the folding roller n will approach the bottomdisk Z) as a` consequence of the double-arm ratio of leverage'at thefolding roller lever i. This train of movements repeats itself at every1oscillating movement of the guide roller lever e caused by therevolution of the guiding cam CZ, and in this the above mentionedratchet wheel g with the pawl Z, and assisted by the keybrake r willoperate in the manner of a ratchet, and will causel the lifting cam p torevolve around its axle f intermittently. Hence the folding roller nwill gradually approach the bottom disk and if a can has been put inplace, will perform the folding work. As soon as this is finished,i. eif the carrying roller 0 has passed the highest point of the liftingcam, the carrying roller will run valong the declining branch of the camby action of the tension spring t, and the folding roller n will moveaway from the bottom disk.V A stopping-pin u is'provided on the liftingcam p, which will throw out of action, by means of the angle-lever o andlever w, the friction coupling a and thereby will stop the machine. Thesaid stop s is adjustable so as to-produce, by acting sooner or later onthe ratchet-lever 7c, a greater or less advance of the ratchet-pawl Z, amore rapid orslower turning of the lifting cam p and, consequently alonger or shorter duration of the folding operation, and hence makeadjustable to different numbers of full turns the can-revolution speedper one folding operation. y

The same train of operations and movements, as above described for thefirst or preparing folding roller, 'occurs in a similar way in the caseof the finishing folding roller, in which case, however, the foldingoperations of both rollers occurs in the corresponding sequence duringone revolution of the lifting cams only.

Y In the same manner this mode of driving may be used also with foldingmachines with slides or supports or carriages serving as folding rollercarriers in contra-distinction to the example given here and relatingtoa machine with levers as folding-rollercarriers, or machines withrotating folding tools and stationary guiding cam and can.

The operation is as follows:

The can to be folded is placed on the lower bottom disk c. By depressingthe foot-lever c the can together with the lower bottom disk c is liftedand jammed tight between the upper and lower bottom disks o and c; atthe same time the friction coupling a is made to operate and the workingspindle of the machine and withr it the guiding cam d andthe can to befolded' are thereby made to rotate. `I-Iereby the oscillating movementsof the folding roller lever e are started and consequent upon this,.bymeans of the ratch- 'et lever lo with pawl VZand stopk 8 as describedabove, the intermittent rotary movement of the lifting cam 7) andconsequently the folding operations of the folding roller n. As soon asthe lifting cam o has described complete revolution around its axle f,the stop-pin laffixed to it will strike the angle lever v@ Hereby thelatter is moved around its pivoting point z, the lever fw is lifted fromout ofthe locking position, the notch having caught on throwing themachine into operation, and now.- the friction coupling a is releasedand the machine stopped. At the same time the foot-pedal, which hadremained in its 'depressed position during work, goes back into itsraised initial position of rest, and the lower bottom disk c lowers downwith the folded can into its initial position.

I claim:

l. In a can end folding machine, in combination with bottom discs andnon-circular guiding cam fast to one of the discs, a guide roller leverpivotally mounted at a point intermediate its ends and provided withv aguiding roller which is guided by said cam. a pawl operating leverpivotally mounted at a point intermediate its ends at the other end ofthe guide roller lever, said pawl ops erating lever being provided atits inner end with a pawl, a stop element arranged in the path ofmovement of the outward end ot' said pawl operating lever, a foldingroller Ylever pivotally mountedat a point intermediate its ends on saidguide roller lever and provided at its outer end with a folding rollerand at its inner end with a carrying roller, a spring active to move theguide roller end of said guide roller lever outwardly, a lifting cammount-ed on the pivot of the guide roller lever and against which saidcarrying roller of said folding roller lever bears, and a ratchet wheelfixed to said lifting cam and engaged by said pawl for partial rotationof said lifting cam and said ratchet wheel when said pawl operatinglever engages said stop.

2. In a can end folding machine, in combination with bottom discs andnon-circular guiding cam fast to one of the discs. a guide roller leverpivotally rmounted at a point intermediate its ends and provided with aguiding roller which'is guided by said cam, a pawl operating leverpivotally mounted at a point intermediate its ends at the other end ofthe guide roller lever, said pawl operating lever being provided at itsinner end with a pawl, a stop element arranged in the path of movementof the, outward end of said pawl operating lever, a folding roller leverpivotallj,7 mounted at a point intermediate its ends on said guideroller lever and provided at its outer end with a lfolding roller and atits inner end with a carrying roller, a spring active to move the guideroller end of said guide roll- B tl DGI

er lever` outwardly, .a lifting cani mounted said pawl operating level`engages said stop, on the pivot of the guide roller level1V and the saidstop being adjustable to vary the against which said carrying roller ofsaid extent of movement of saidpavvl operating l0 folding roller leverbears, and a ratchet lever. Wheel fixed to said lifting Cain and engagedIn testimony whereof I aflixed my signaby said paw] for partial rotationof said ture.

lifting vCain and said ratchet Wheel when RICHARD RODER.

